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REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenue from External Customer [Line Items]
NET SALES	$ 908	$ 738	$ 2,530	$ 2,213
Contract with Customer, Asset, after Allowance for Credit Loss, Current	24		24		$ 23
Contract liabilities	8		8		11
Accumulated depreciation	3,800		3,800		$ 3,800
Europe Segment
Revenue from External Customer [Line Items]
NET SALES	257	214	725	666
Latin America Segment
Revenue from External Customer [Line Items]
NET SALES	200	150	557	434
North America Segment
Revenue from External Customer [Line Items]
NET SALES	451	374	1,248	1,113
Uncoated Papers \| Europe Segment
Revenue from External Customer [Line Items]
NET SALES	188	160	524	498
Uncoated Papers \| Latin America Segment
Revenue from External Customer [Line Items]
NET SALES	187	131	520	394
Uncoated Papers \| North America Segment
Revenue from External Customer [Line Items]
NET SALES	429	361	1,194	1,072
Coated Paperboard / Other \| Europe Segment
Revenue from External Customer [Line Items]
NET SALES	28	23	77	69
Market Pulp \| Europe Segment
Revenue from External Customer [Line Items]
NET SALES	41	31	124	99
Market Pulp \| Latin America Segment
Revenue from External Customer [Line Items]
NET SALES	13	19	37	40
Market Pulp \| North America Segment
Revenue from External Customer [Line Items]
NET SALES	$ 22	$ 13	$ 54	$ 41